Drawing instrument.



0'. E. JOHNSON.

DRAWING INSTRUMENT.

APPLICATION FILED OCT- 28, I916.

Patented Oct. 2,1917.

K} 2 SHEETS-SHEET 1.

7' I ,9 K Z a"? f 1 r I In"... i A95 4 I v I ammo z, azfljknswz WM:

C. E. JOHNSON.

DRAWING INSTRUMENT.

APPLICATION FILED ocr. 2B. 1915 n m/ w 9 H a M a 7m J d m w s 1 m M a m M fl w x J v 6 z u/ 1 a CHARLES E. JOHNSON, OF NEW YORK, N. Y. Y

.no I

. DRAWING INSTRUMENT.

Specification of Letters Patent.

' Patented a. 2,1917.

Application filed October 28, 1916. Serial No. 128,267.

v To all whom it concern:

Be it known that 1, CHARLES E. JOHNSON, a citizen of the United. State's, residing at New York, in'the county of New York and State of New York, have invented new and useful Improvements in Drawing Instru- 1nents,'of which the following is a specifica tion. 1 1 v The present invention relates toimpro'vements the construction of drafting implements. v

In carrying out my invention it is my purpose to producea drafting implement whereby curved figures of various sizes may be accurately described.

It is a still further object of the invention to produce an instrument of this character which may be accurately operated by persons not particularly skilled in the art of drafting, and which shall be of asimple construction, comparative'lyicheap to manuscribed. Arranged centrally 'upon'the outer operation. 4

'Wi'th the above and other objects in view the improvement resides in the construction, combination and arrangement of parts set forth in the following specification and, falling within the scope-of the appended claims.

In the'drawingsz h Figure 1 is a perspective viewillustrating the improvement, I p

Fig. 2 isa central vertical longitudinal sectional view through thesame, 1

Fig. 3'is a sectional view-approximately on the line 33of Fig. 2, and 1 I I Fig. 4 is a sectional'view'approximately on the line H of Fig. 2.

facture as well as efficient and. accurate in Referring now to the drawings ll'l detailthe numeral 1 designates the foot member of the instrument, .the same being preferably rectangular in plan and has its underface concaved and its outer fa'ceconvexed." The foot, at the corners thereof, is'provide'd with depending entering points 2, whereby the same may be effectively sustained upon the board upon which the figure is to be deconvexed surface of the foot is a sleeve 3,

' the same being ofany. desired length and ing an elliptical periphery, the said body being centrally provided with an outwardly extending collar '5 which, of course, also ,surrounds the sleeve 3, the said collar being shapes. The body 4 preferably has its underface concaved,"and in order that the same may be of an equal thlckness throughout the outer face of the said body may be convened f as shown by the drawings.

The sleeve 3 is adapted to receive the reduced inner portion 7 of what I will term I tion 7 of the leg has its outer end provided the inner leg 8 0f the instrument. The porwitha reduced threaded extension 9 upon whichis screwed a nut l0,the said nut contacting with a washer 11 which abuts" against the concaved'face' of the foot 1 and thus the leg 8 isrevolubly secured to the said foot. y The shoulder between the leg' proper an'd'the reduced portion 8 therefor rests upon the outer end of the sleeve 3 and I Y the outer end of the said leg 8 terminates in a head 12. This 'liead is bifurcated or centrally slotted, a pin 13 passing trans versely through the said slot, and the'pin is adapted'to receive the convolutions 1 L of a] spring member 15, one end of the said spring contacting with one of thesides' of the head, while the other end of the spring engages with the outer leg of the instrument,'as willbe hereinafter more fully apparent.

The leg stewa d of its head 12, is'formed with a transversely arranged socket l6, the said socket, adjacent one of the ends'fthereof, being widened and its sidesprovided with openings whereby to receive 'a' revolunut is peripherally rounded and its said pev 7100 ble member in the nature of a nut 17. The

riphery'is milled andprojects a'suitabl'e distance beyond the sides of the socket to per mit of the turning of the said nut."

The socket 1.6 at the portion'thereof. 0p-' posite that provided'with the nut and which,

of course, is extended beyond the opposite? side of the leg to the referred to portion provided with the nut has its underface open as indicated by the numeral 18, land disposed vvithin the socket 'is a headed men);

ber 19 having a longitudinally extending shank 20. It should be stated that the bore of the socket is of a rectangulanformation and that the shank 20 is of a like formation in cross section, but the opposite edges of the said shank are provided With threads 21 Which are cngaged'by the threads in the bore of the nut 17 By this I arrangeinent it Will be noted that upon the manipulation of the nut 17 the head 19' may be moved laterally in either direction With respect to th eleg8L Pivotally secured v as at 22, to the head 19 of the adjust-ablesh'ank 20, is the bifur-j cated end or head 23 of the outer leg 2 k of the instrument; and the spring 15 contacting with the said outer leg 24c win svving the same upon the p vot .22 I 111139 contact ng engagement w th the periphery of the body L.

The leg24 is provided with an opening Which enters from the outer end thereof so that the shank 25 ofkthe marking member v I l QGmay bere ceived therein, Theleg' s provided \vit'h abiiiding elementQ'T, in the nature of a set screw which contacts with 'the shank2'5 and retains the same in a properly adjusted position ivith respect to the leg 24. The leg 2l-fupon the outer face thereof, and adjacent theouter or l'ower end of the same is provided with alongit'u'di'nally ar ranged slot28, communicating With the bore" of the said leg and passing through tliis slot and adapted tobereceiv'ed in one of plurality of spaeed perforations in the shank;

25 is the stein 29iof a h'eaded member 30.,

Disposed the bore of :the leg 24:, and having one of ,its ends secured therein in any desired or preferred manner is, a

helical spring 31, the opposite endtolf the said sprin g' being secured to the shank 29 of the me1 nber 30, and arranging said shank" in a desired perforation32 in, the shank 25 the pressure ofthemarking element 26v upon the V board or L paper be' iii c'ely regulated It is to be understood that the marking element26 is in titanium ofa removable memberso that the shank25 may be provided ;W1tll e ther a penciling or an inking instrument.

It' v i ll, it is thought be perfectly obvious to those acquainted; viththe employment of i an lnstrument'as herein described tliat it is merely necessary to adjust the guidebody 45 01 What may be termed the ellipsis of the instrument, longitudinally of: the sleeye 3 to cause the leg 24. to be moved outiyardlv or inwardly iv'ith respeetto the sleeve 3 and foot l so that curved figures of difierent,

sizes'may'be described by reyolvingthe leg 8 m tntd the sleeve; It vWilL-alsobe apj parent that figuresof veurying sizes may be descrihed wit hout iad'justin g the member 4,1 in Whichlii stance the jnut is turned to move the member 20 longitudinally of'the socket l6, and this latter method of adjustment is also desirable When the marking implement is in the nature of a pen and \vherein both of the nibs of the pen are desired to be properly brought into contact With the paper or board uponfWhich the ellipse is to be described.

' The adjustable means Which pivotally secures the outer leg of the COIIlQa SStQ lZhQiiD nenleg thereof also permits of thefdeviee describing L elliptical figures of; difierent breadths Without;adjustingthe form 4, as

for instance, when it is"desirable that thep propertioned to suit the cemands 'ot the user.

Having thus described the inventien, What I claim, is: j l

1}, Ina drai;tinginstyument, a compass including an inner and an outer leg a body adjustably associated JVltll the inner leg ae longitudinally adjustable- 'el ementjarranged i s sel 1 ifiiier J st w al, an:

t a etw snh aid lem nt n e m er leg, and spring means for swinging the uts i s i t ntact w t e; di'i sta l body 4 e H i 2.: In a dnaftingv implement, the combined;

n'l ith? l el -infi 69 5 n t mpass; compr s ng an nner and an outer leg, and

the said inner leg revolubly as sociated with e a d. el i a dy. n. adju t b e member arranged transversely oii the -innerleg Pi t l em ati n tween. a d. memb r and the outer leg and spring meansconv sted. Wi htha niia ev and e g g ng i -h the outer leg tq force,thelatteninto co n tacting enga ement With the ellipti l body. 3. In a drafting implement, the combina; lJlQIIXZllEll an 'ellipti calj;bo, ;ly,- of a com'pass 9 121 51 155 lt i ner Landsan: uter .levgnanda .1 6 l g r rolublv sso ia ed. wi h the .i

said ellipticalhody, a longitudinally;adjustable element arranged transversely of- ,the

inn g; pit tal. nectiq eb twie asaid 3 m nt, icl 1 h? te g, pringmcans; for swinging the outer leg) into peripheral. 1.

engagement With I thej elliptical body,- at

marking element ,associated withi the gout-er.

leg,

spring means for normally projectingev the 7 said marking element outward .of ,i-the1l sa douter leg, and adjustableprmeansfor 4 regulating said spring: means. I

l. Ina draft ng implement, a foot having a sleeve projecting,,theref1;om,,. anellintical dy Min-stably Securedto the sleeve, a com; pass nclud ng a111,,1I1Ii61. and .an ,outerlleg,

j said,imier legjjournaled in the sleeve v a laterally disposed longitudinally adjustable Y element associated with the inner leg, and a pivotal connection between said element and the outer leg of the compass.

5. In a drafting implement, a foot member having entering points and having a sleeve connected thereto, a compass including an inner and an outer leg, the inner leg of the compass journaled in the sleeve, a longitudinally adjustable element associated with the inner leg and disposed transversely thereof, a pivotal connection between the said element and the outer leg of the compass, spring means upon the inner leg and engaging with the outer leg for swinging the latter in the direction of the inner leg, and an adjustable body upon the sleeve disposed to contact with the said outer leg to limit the inward swinging thereof and to serve as a guide for the said outer leg when the instrument is in use.

6. In a drafting instrument, a foot having its corners provided with entering points, a sleeve for the foot, a body having its periphery of an elliptical formation ada threaded shank disposed in the socket, 'a

nut engaging said shank and arranged in a transverse opening in the socket, the second leg of the compass being pivotally secured to the head of the said member, a

coiled spring upon the first mentioned leg and engaging with the second mentioned leg to swing the latter against the elliptical body, said second mentioned leg having a bore, a marking element having itssshank arranged Within the bore, a binding element upon the said leg engaging with the shank, said shank having spaced perforations, a member, passing through a slot in the said second mentioned leg and received in one of the perforations, and a pressure spring secured within the bore of the leg and en-: gaging the said member.

In testimony whereof I alfix my signature. I

I CHARLES JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). G. 

